Ventilator ifor cabs



E. V. HILL.

VENTILATOR FOR CARS.

APPLICATION FILED mm. 1916.

Patented Aug, 5, 191.9.

UNITED STATES PATENT OFFICE.

EARL V. HILL, OF CHICAGO, ILLINOIS.

VENTILATOR FOR cans.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application and January 7, 1916. Serial No. 70,803.

My invention relates more particularly toan intake-ventilator adapted to be applied tothe vertical sash at the front of the car and above the roof thereof. Intake ventilators have vheretofore been very little employed for the reason that the amount of air taken into the car through the ventilator it depends upon the speed of the car, by reason of which, if the ventilator be of suflicient size to admit the required amount of air when the car is stationary or moving at slow speed, it admits entirely too much air when the car moves at high speed, unduly cooling the interior of the car. On the other hand, if the ventilator has a capacity adapted for fast movement of the car, it

is practically useless for ventilation when at the car is moving slowly or is stationary.

By my invention l have provided a ventilator which is not open to this objection, but automatically controls the entrance of air so that substantially the same amount so enters the car at all times, which amount is independent of the speed at which the car is moving. In the accompanying drawing 1 have shown, and in the following specification described, the preferred form of my invention. It is to be'understood, however, that the specific disclosure is for the purpose of. exemplificati-on only, and that the scope of the invention is defined in the following to claims in which I have endeavored to distinguish it from the "prior art so far as known to me without, however,.relinquishing or abandoning any portion or feature thereof.

In the drawing, Figure 1 is a longitudinal section through a ventilator adapted to a car, and through so much of the car itself as is necessary to understand the application of my invention, and Fig. 2 is a fragmental-y detail in plan.

The roof 3,sash 4, and malaria a the car, may be and are shown as of an ordinary construction, though iny invention is applicable to cars of whatevercharacter. The

ventilator comprises a tubular casing 6,-

which may be of rectangular or other desired cross-section, and open at the front as at 7, and rear as at 8, a flange 9 being provided at the latter opening for securing the ventilator to the frame 10, by which it is attached to the sash 4. If desired, though this is not essential, the ventilator may provided with a series of pivoted plates 11, of the usual type for closing the opening into the car, and diffusion plates 12, 13 at the front and rear, respectively of the ventilator for diffusing the air to all parts there- -of. .At the front the ventilator is preferably provided with inclined slats or louvers 14, to prevent rain or snow from driving in.

The main feature of my invention consists in a means for maintaining the amount of air fed to. the car substantially the same,

notwithstanding the speed at which the car may be moving. For this purpose I have provided two hinged plates 15, 16, which together are adapted to substantially close the passage through the ventilator. The plate 15 is pivoted at 17 and provided with a. lug 18, which receives an ad uSting rod 19,.

adapted to be held by screw 20. The plate 16 is preferably pivoted on the same axis as the plate 15, but is suspended from the axis by arms 21, extending from opposite edges of said plate 16, and movable past the edges of plate 15, so that plate 16 may freely swing about its axis. It will now be apparent that the current of air driven through the ventilator by the motion of the car will swing the plate 16 rearwardly a distance dependent upon the speed of the air. The course of the air is as indicated by the arrows A, B,

over the upper edge of the plate 16 and under the lower edge of the plate 15, and consequently the farther plate 16 is displaced from the vertical by the currentiof air, the smaller is the passage between the plates. The Weight of the plate 16 is so determined, and the plate 15 so adjusted, that the proper amount of air will pass through the opening between the plates, notwithstandin the speed of-the car upon which the venti ator is mounted.

l have found, however, that unless special provision is made to the contrary, the plate 16 is inclined to swing backward and forward under the pressure of the air. In

order to obviate this dificulty, I provide for the escape of the air coming in contact with said plate. For this purpose the lower Wall or floor of the ventilator, which is curved as at Q2 to correspond to the curve v of movement of the lower edge of the plate 16, is pierced at 23 by a series of slots 24, the forward ends of which are narrow, and the rear ends relatively broad, thus providing escape fora quantity of air proportional to the amount entering theventilator. Beneath the ventilator I have provided cross-strips 26, 27, which form with the bottom of the ventilator and the roof of the car, a transverse passage open at its ends and communicating with said slots 24, thus furnishing an escape for the air coming against the plate 16, and thereby steadying the latter and preventing it swinging to and fro.

I claim:

1. An intake ventilator for cars and the like, comprising a casing, a plate 16 suspended therein and movable under the pressure of air to restrict the passage through the ventilator, one of the walls of the ventilator adjacent, a movable edge of the plate having perforations so positioned as to be uncovered by movement of the plate to permit the escape of air.

2. An intake ventilator for cars and the like, comprising a casing, a plate 16 pivot ally mounted in the casing and free to move rearwardly therein under air pressure. the bottom of the casing being curved to correspond. to the plane of movement of the edge of said plate, there being openings in the curved portion of said bottom adapted to provide exit for the air pressing against said plate.

3. An intake ventilator for cars and the like, comprising a casing, a plate 15 pivotally mounted in the casing and free to move rearwardly therein under air pressure, the bottom of the casing being curved to correspond to the plane of movement of the edge of said plate, there being wedge-shaped openings with enlarged rear ends adapted to permit the escape of air from the front of said plate.

1. An intake ventilator comprising a casing, a' plate 15 pivoted and adjustable therein, a plate 16 pivotally suspended upon the same axis as the axis of the plate 15 in the "entilator and cooperating with said plate 15 to control the passage of air through the ventilator, such swinging plate being movable under air pressure to restrict the passage of air.

5. An intake ventilator for cars and the like, comprising a casing, an abutment in the upper portlon of the casing partially cutting off the passage of air therethrough, a plate 16 suspended substantially below the abutment, a pair of arms 21 pivotally suspending said plate in the casing upon an axis adjacent the upper portion of the abutment, said plate being free to move under the pressure of air entering the casing to a position to restrict the passage of air.

EARL V. HILL. 

